/*
 * Copyright (c) 2017-present, CV4J Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cv4j.core.filters;

import com.cv4j.core.datamodel.ColorProcessor;
import com.cv4j.core.datamodel.ImageProcessor;

import java.util.Optional;

/**
 * 基地过滤器
 *
 * @author dev
 * @date 2021/07/22
 */
public abstract class BaseFilter implements CommonFilter {
    /**
     * 宽度
     */
    protected int width;
    /**
     * 高度
     */
    protected int height;
    /**
     * 红色的
     */
    protected byte[] RED;
    /**
     * 绿色
     */
    protected byte[] GREED;
    /**
     * 蓝色的
     */
    protected byte[] BLUE;

    /**
     * 过滤器
     *
     * @param src src
     * @return {@link ImageProcessor}
     */
    @Override
    public Optional<ImageProcessor> filter(ImageProcessor src) {
        if (src == null) {
            return Optional.empty();
        }

        if (!(src instanceof ColorProcessor)) {
            return Optional.ofNullable(src);
        }

        width = src.getWidth();
        height = src.getHeight();
        RED = ((ColorProcessor) src).getRed();
        GREED = ((ColorProcessor) src).getGreen();
        BLUE = ((ColorProcessor) src).getBlue();
        return doFilter(src);
    }

    /**
     * 做的过滤器
     *
     * @param src src
     * @return {@link ImageProcessor}
     */
    public abstract Optional<ImageProcessor> doFilter(ImageProcessor src);
}
